Intake Temperature Logging, Highway Only RunsBackground data:
In this chart the engine was fully warmed up for at least an hour before logging. All log points are at highway speeds ranging from 65 to 90 mph. The two lines show travel in opposite directions. The stock data was recorded driving one way from Tucson to Sunsites AZ over approximately 1.5 hours. The modified data was recorded driving from Sunsites to Tucson over the period of about 1 hour the next day.

Interpretation:
The modified intake plot #5 notes a large, several mile long hill, the type that bring semi-trucks down to 55mph on the death march back up. This most likely accounts for the slight increase, in addition to the fact that one must enter a deep valley to get to it (vally floors are always warmer, ambient). I cannot explain the sudden 5 degree drop for the stock intake at the second plot point. The spike on the stock plot #10 indicates where my mom hit a deer and we slowed down to about 55 for the remainder of the trip (not very far after that anyway). I didn't record any further plots at that speed to avoid skewing the data. Mom, mom's car, and the deer are all okay due to mom's badass driving skillz. :-)
You can see a solid 10-15 degree F improvement over stock during the duration of the trips. This validates my theory that the stock intake system will terminally heat-soak if given enough travel time.
Copyleft Mark Leinhos
Last modified 08/04/15